/*
 * The contents of this web application are subject to the Mozilla Public License Version 
 * 1.1 (the "License"); you may not use this web application except in compliance with 
 * the License. You may obtain a copy of the License at http://www.mozilla.org/MPL/.
 * 
 * Software distributed under the License is distributed on an "AS IS" basis, 
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License 
 * for the specific language governing rights and limitations under the License.
 * 
 * The Original Code is owned by and the Initial Developer of the Original Code is 
 * Composite A/S (Danish business reg.no. 21744409). All Rights Reserved
 * 
 * Section 11 of the License is EXPRESSLY amended to include a provision stating 
 * that any dispute, including but not limited to disputes related to the enforcement 
 * of the License, to which Composite A/S as owner of the Original Code, as Initial 
 * Developer or in any other role, becomes a part to shall be governed by Danish law 
 * and be initiated before the Copenhagen City Court ("K�benhavns Byret")            
 */

using System.Collections.Generic;
using System.Configuration;
using Composite.Core.Collections.Generic;
using Composite.Core.Configuration;
using Composite.C1Console.Events;
using Composite.C1Console.Security.Plugins.HookRegistrator;
using Composite.C1Console.Security.Plugins.HookRegistrator.Runtime;
using Microsoft.Practices.EnterpriseLibrary.Common.Configuration;


namespace Composite.C1Console.Security.Foundation
{
    internal static class HookRegistratorRegistry
    {
        private static ResourceLocker<Resources> _resourceLocker = new ResourceLocker<Resources>(new Resources(), Resources.DoInitializeResources);

        static HookRegistratorRegistry()
        {
            GlobalEventSystemFacade.SubscribeToFlushEvent(args => Flush());
        }



        public static IEnumerable<string> HookRegistratorPluginNames
        {
            get
            {
                using (_resourceLocker.ReadLocker)
                {
                    return _resourceLocker.Resources.HookRegistratorPluginNames;
                }
            }
        }



        private static bool HasConfiguration()
        {
            var configSource = ConfigurationServices.ConfigurationSource;

            return configSource != null && configSource.GetSection(HookRegistratorSettings.SectionName) != null;
        }



        private static IConfigurationSource GetConfiguration()
        {
            IConfigurationSource source = ConfigurationServices.ConfigurationSource;

            if (null == source)
            {
                throw new ConfigurationErrorsException(string.Format("No configuration source specified"));
            }

            return source;
        }



        private static void Flush()
        {
            _resourceLocker.ResetInitialization();
        }



        private sealed class Resources
        {
            public List<string> HookRegistratorPluginNames { get; set; }

            public static void DoInitializeResources(Resources resources)
            {
                if (HasConfiguration())
                {
                    resources.HookRegistratorPluginNames = new List<string>();

                    IConfigurationSource configurationSource = GetConfiguration();

                    var settings = configurationSource.GetSection(HookRegistratorSettings.SectionName) as HookRegistratorSettings;

                    if (settings == null)
                    {
                        throw new ConfigurationErrorsException(string.Format("Failed to load the configuration section '{0}' from the configuration", HookRegistratorSettings.SectionName));
                    }

                    foreach (HookRegistratorData data in settings.HookRegistratorPlugins)
                    {
                        resources.HookRegistratorPluginNames.Add(data.Name);
                    }
                }
                else
                {
                    resources.HookRegistratorPluginNames = new List<string>();
                }
            }
        }
    }
}
